Soaking in a hot tub sounds better than any form of physical exertion, right? The heat forces your heart to work hard, thus mimicking a walk on the treadmill , so we can all skip the hamster wheels! Not so fast. While a hot bath does emulate exercise by regulating blood sugar, producing sweat and burning extra calories (awesome!), other key benefits provided by regular exercise are missing. However, adding in daily tub time in addition to your workouts can take your calorie burn and physique to the next level.
https://www.shape.com/lifestyle/beauty-style/can-warm-bath-seriously-replace-your-workout